Kongsberg Simrad ST90, Reference Manual

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Defining the physical size of the tracking area
When you have an echo you wish to track, the tracking functionality places a geographical
area around the object. An invisible area - the tracking area - is created as an acquisition
area. In order for the ST90 system to find and lock on the intended target, it needs to be
kept within this tracking area. If the intended target falls outside the area, the tracking can
not be started. Use the
Tracking Area Setup
dialog box to define or change the physical
size of the tracking area.
Context
Illustration:
A
Each
Tracking Area
option controls the distance from
the inner to the outer radius of the area.
B The width of the area is fixed, and stretches across
a predefined number of beams. This means that the
actual width depends on the distance from your vessel
to the area.
The
Tracking Area
function is used to select the physical
size of the area.
You can only define the area size as the distance from the
inner to the outer radius of the area. The width of the area is
fixed, and stretches across a predefined number of beams.
To track a target efficiently, the area should be as small as
possible. For example, use a small area if you track single
fish or small schools. However, if the target is large, or
moves very fast, a larger area may be beneficial. This may
be useful if you track a large school of fish.
Tip
Under certain circumstances the target tracking may not
follow the intended echo. This may for example happen
if the tracking area is too large.
When the size of a tracking area has been changed, the new size will take effect the next
time a track is manually initiated.
Procedure
1 Open the
Setup
menu.
2 Select
Tracking Area
on the
Setup
menu, open the button submenu, and select
Tracking
Area Setup
.
Operating procedures